Explorist 310 2D or 3D map view

Hello there, I received my new Explorist 310 recently but for some reason there is no drop down menu to select 2D or 3D Map View. The manual states that you should be able to change the view under "Map Options" but no drop down menu exists. I have the latest ver 1.58 software and the only maps I have installed are the ones that came with the unit which s the World Maps No. WWNA_BM.MGI.

I have ordered the Topo Maps for NSW, Australia which are by Summit, perhaps these will work with the 3D view.